Kenwood KRC-21SA, Руководство по обслуживанию

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KRC-21SA/SG/SYA/SYG
KRC-266/S
3
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SYNTHESIZER UNIT (X16-149x-xx)
COMPONENTS DESCRIPTION
Ref.No. Application/Functions Operation/Condition/Compatibility
IC1 LCD driver with key-matrix
Q1 Key-matrix permission SW Ready on key-matrix
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SYNTHESIZER UNIT (X14-685x-xx)
Ref.No. Application/Functions Operation/Condition/Compatibility
IC1 System MI-COM. System control
IC2 E-VOL. & N.C. MPX Controls sound volume. Selects each source.
IC3 Mute logic 3-input NOR gate x 3
IC4 Power IC Amplifies power so that the speaker can drive audio signal.
IC5 Equalizer amplifier Equalizer amplifier for cassette tape sound
Q50
BACK-UP detection(Momentary
power down detection) SW
While BACK-UP is added, a base becomes Hi, and Q50 is turned on.
Q51
BACK-UP 5V AVR
While BACK-UP is added, AVR o5V.
Q52
Q51 and Q52 is inverted Darlington connection.
Q53 P.ON 5V SW While a base becomes Lo, Q53 is turned on.
Q54
COM+B SW
While Q54's base becomes Hi, Q55 is turned on.
Q55
Works during POWER ON mode.
Q56
COM+B AVR
While Q57's base becomes Hi, Q56 is turned on.
Q57
Q56 and Q57 is inverted Darlington connection.
Q58
IllumiB SW
While Q58's base becomes Hi, Q59 is turned on.
Q59
Works during POWER ON mode with a panel attached to the set.
Q60
IllumiB AVR
While Q61's base becomes Hi, Q60 is turned on.
Q61
Q60 and Q61 is inverted Darlington connection.
Q150 Electric volume mute SW
When BACK-UP detection SW or CHANGER RESET SW or MI-COM.'s mute
works, a base becomes Hi, and Q150 is turned on.
Q151 SVR discharge SW When POWER IC RESET is activated, a base becomes Hi, Q151 is turned on.
Q153 Pre-out mute driver
When BACK-UP detection SW or CHANGER RESET SW or MI-COM.'s mute
works, a base becomes Lo, and Q153 is turned on.
Q200
FM +B SW
Q201 is turned on when Q200's base becomes Hi.
Q201
Works during FM reception mode.
Q202
AM +B SW
Q203 is turned on when Q202's base becomes Hi.
Q203
Works during AM reception mode.
Q260
Motor +B SW When Q260's base becomes Hi, Q261 is turned on. Works during TAPE mode.
Q261
Q301 Changer reset SW When a base becomes Lo, Q301 is turned on.
Q320 Panel 5V SW While a panel is attached to the set, a base becomes Lo, and Q320 is turned on.
Q350 P-CON. driver When Q353's base becomes Hi, Q350 is turned on.
Q351 P-CON. protection SW Works when P-CON is being short-circuited on GND.
Q352 P-CON. protection inhibit SW Inhibits protection SW function when P-CON works momentary.
Q353 P-CON. SW Q353 is turned on when a base becomes Hi. Works during POWER ON mode.
Q370
ANT-CON. SW Q370 is turned on when Q371's base becomes Hi.Works during TUNER mode.
Q371
Q450 Pre-out mute SW (R ch.) When BACK-UP detection SW or CHANGER RESET SW or MI-COM.'s mute
Q451 Pre-out mute SW (L ch.) works, a base becomes Hi, and Q450,451 are turned on.
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